Piston



FIG. 1 is a perspective view of piston in accordance with the preferredembodiment of the present invention, showing my design;

FIG. 2 is a front view of the piston shown in FIG. 1;

FIG. 3 is a rear view of the piston shown in FIG. 1;

FIG. 4 is a left side view of the piston shown in FIG. 1,

FIG. 5 is a right side view of the piston shown in FIG. 1;

FIG. 6 is a top view of the piston shown in FIG. 1; and

FIG. 7 is a bottom view of the piston shown in FIG. 1; and,

FIG. 8 is perspective view of piston showing my new design inenvironmental use.

The broken lines shown represent unclaimed subject matter and form nopart of the claimed design.

CLAIM I claim the ornamental design for piston, as shown and described.